Process of manufacturing arsenic compounds of lead.



PATENTED NOV. 12, 1907.

' 0. D. VREELAND. 7

PROCESS OF MANUFACTURING ARSENIG COMPOUNDS 0P LEAD.

APPLICATION FILED FEB. 5, 1906.

was.

STATES ATE'ngr'bFFI- .1 CORNELIUS n. vnnnmun, or MONTCLAIR, NEW-JERSEY;

PR C SS OF nsmhccrnnme ARSENIC oomrormnsos :ILEAD.

To all whom it may comm; i

Be it known that I, Corrsnmus D, VRnnnA'nn, a citi-- V zen of the UnitedStates, residing in the town of'Montessary in the processes now usedior:this'purpose. As

the art is now practiced, these compounds' are'manw' factured bydissolving leador an oxid thereoiin nitric or acetic acid, precipitatingthe dissolved lead by an arsenic compound, recovering the prcipitate,reeovering the by-product, etc., evaporation and crystallization usuallybeing necessaryQ' i 5 My invention consists in the production byele'ctrolysis of a soluble salt of lead in the presence of a solublecompound of arsenic and its'immediate precipita- "tating the lead saltthus formed by means of a solublev tion by the latter as an arseniccompound of lead.'

My invention is practiced by immersing a mass of, lead orof a suitablecompoundthereoi in a solutionofan electrolyte which, under the influenceofan electric current, will produce a solvent oflead, passing a, currentof electricity through the solution and precipi compound of arsenic.

My process can be carried out with appaxatusof a variety of types and anumber-oidifierentreagents maybe used interchangeably. u

The accompanying drawings-illustratemne, of the types of apparatusreferred to in which drawings 'Figure 1 is a sectional elevation andFig. 2 is a sectional elevation at right angles-to that sliown in Fig. 1on the line X-X thereof.

In these drawings is shown a v shaped tank having walls F, F'maintainedby supports G, G. This tank forms or constitutes an anode compartment A,A in which is inserted the anode or series of anodes C, 0 connectedelectrically at D m the bus-bar. H. The anode or series of anodesmay besuspended or may rest upon the walls of thetanli, as shown. Alternatelydis posed between said series of anodes are theseiis of porouscathodecompartments B, resting upon the in-.

- (-liucd walls F, F of the tank. In each cathode com ,partment issuspended a cathode B electrically connected at E to-the othercommonconductor E con .ductors H andE being connected to a source ofclec-' trical energy not shown.

In the type-of apparatusillustrated as that .with which I practice myinvention at present, I employ a Application filed February-5.1906.Serial No. 299,434.

cell or tank divided as shown into a series of anode and r I Specifcation of Letters Iatenti Patented Nov. 12 1907.

"cathode compartments. Each cathode compartment I consists of a porousreceptacle-which is filled with a solution of sodiumhydroxid of sin lestrength,'and a cathode is immersed therein consisting of a plate ofiron. The anode compartmentis filled'with an aquc-' ous solution ofsodium nitrate and the anode immersed tion the sodium nitrate is splitup by electrolysis .and the nitric acid radical unites with the lead,forming soluble lead nitrate, while the sodium passes-into the porouscup. Into this anode compartment I introduce a solution of a sodium saltof arsenic, for example, so .dium arsenate, which reacts upontheleadsalt to produce load arsenate andsodium nitrate. The former,

'therein consists of aplate or cylinder of metallic lead; 4 -When theelectric current is passed through the solu-" being a heavy insolublesubstance, is precipitatedout of the solution and settles to the bottomof the vessel,

whence it'can be drawn off in any suitable'manner. The soluble sodiumnitrate thuslormedis in conditionto' be once moreelectrolyzed, asbefore.

into the compartment contiriuously'in just the-proper quantity to reactupon the leadnitrate formed, and as this latter action can bequantitatively dete'rmined',

regulated: As l have stated; I prefer to introduce the arsenic saltdirectly into the anode compartment of the cell, but if desired the leadnitrate formed as the result of the electrolysismay be drawn off intoanother reoep- -tacle, the lead salt of arsenic precipitated there, and

I find it preferable tointroduce the arsenic solution theflo'w'of thearsenic compound can be accurately the sodium"nitrate of the reactionreturned to the.

anode compartment. The former method, however, will be found preferable,as he action is practically continuous. It may befound desirable fromtime to time to draw oft a portion of the solution inside the cathodecompartment and to :add water in order to maintain the 'proper degree ofconcentration. I u

I do not wish to be understood as limiting myself to the particularmaterials which-I have enumerated, but desire to claim'bro'adly 'theprocess, irrespectiveoi the particular chemical substances used, which,as will readily be .understood, 1 can be varied considerably withoutdeparting from the spirit of my invention: for example, for the cathodeat present I use an iron plate 1 merely bedause it is inexpensive andvery littleafi'ected by the action, although other substances, such ascarbon, could, of course, be used .without essentially altering theprocess. Again, the anode may consist ofamass of an oxid of lead insteadof the lead plate.

or potassium, or.certain other compounds, theessen- I The electrolytemay be the nitrate or acetate of sodium tial requirement being'that itshall be ail electrolyte which under the influence of the electriccurrent will separate into a solvent of lead. The arsenic salt used maybe sodium arsenate or sodium arsenite, orapotassium' salt of arsenic,-orsome other soluble arsenic comoaasna'wa comhine with 'thesoluble 1a 1--sa1 to produce an insoluble lead compound of arsenic? As,. for example,a solutio'n of arsenic acidwwhich re-acts uponvthe l eadrsaltto'producelead arsenate ahd nitric .acid-Q-lThel nitric acid thus iormedneutralizes the sodium hydroxi d which diffuses iromfthe cathodecomarrmem, forming sodium nitrate, "which is e1ectro'- yz'ed'as before.a I find-that it aids the action ofthe cell toiprovide some-means foragitating the contents ofthe anode,

chamber inforder to pre'vent any deleterious deposit being formed uponthe anode; This, beaccomany of the means commonly employed'to 3 1.effect sucha result. .15

fIn-order to prevent the'possihle formation of undesirable basic salts,I prefer'tomainta'in the electrolyte in a slightly acid condition.

Having described my invention,what I clai misr 1. The process'ofmanufzrturing arsenlcco'm'p'ounds of lead which consists ortheformatlonof'a soluble salt 01! lead by electrolysis in the presence of a solublecompound thereby as an arsenic compound of lead.

2. The process of manufacturing ars'enlc'compounds or Vleadwhlchconsists in placing a body 01 metallic lead in a solution oradelectrolyte which undertlre influence or of arsenic and thesimultaneous precipltation'ot the lead "the electric current willseparate into a solvent of lead attire anode and dissolve the leadatheretrom and i!i pre cipltatlng the leadthusbrought into solutlonwlth asoluble compound of arsenic.

3. The process of manufacturlng arsenic' compounds of lead whichconsists in immersing a suitable cathode in a solution of an alkalinehydroxid contained within a porous receptacle, immersing said porousreceptacle in a vessel containinga solution of an electrolyte whichunder the influence o1! thelelectrlccurrent will separate into asolvennof lead, immersing in said electrolyte an anode consisting of abody of lead or of a compound thereof, pass- ;lng ancictric currentthrough the circuit, and introducing into the anodecompartment a solublecompound 01' arsenic.

4; The electrolytlc .process of manufacturing arsenic "salts of leadwhich consists in immersing the cathode in afsolution of analkallnehydroxld contained in a porous receptacle, immersing said porousreceptacle in a vessel .'containing an;anode or lead or of a. compoundthereof and an electrolyte which under the influence ot the electriccurrent will separate into a solvent 0!? lead, and introducing into saidanode compartment a solutionv ota" compound of arsenic. T 5. The processor manufacturing arsenic compounds of lead which consists in immersing amass of iron in a solutlon or an alkaline hydroiiid contained-in aporous re;

,6.- The process of manufacturing arsenic compounds of. leadwhlclrconsists in immersing a cathode of ironin a solution of analkaline hydroxid contained lira porous receptacle.immersing, saidporous receptacle in a vessel containing an anode of lead. and asolution of n sait which when electrolyzed will produce a solvent otlead,

passing a current ot electrlclty through the circul't'iind precipitatingthe leadsait thus formed by meo'iisof a soluble compound of arsenic. i v

-. 7. The processor manufacturlng'arsenic compounds of lead whichconsists in immersing a cathode of iron in a solution of an;alkalinehydroxid contalned.in 'a porous receptacle, immersing saidporous receptacle in a vessel containing an anode otiead and anelectrolyte which under the influence of the current will separate intoa solvent oi lead;passing a current of electricity through the meansot asoluble salt of arsenic.

8. The process of manufacturing arsenic compounds of lead which consistsin immersing a cathode-of iron in a solution of an alkaline hydroxldcontained in a porous receptacle, immersing said porous receptacle in avessel containing an anode ot lead and a. solution or a salt which whenelectrolyzed will produce a solvent of lead, passing a current ofelectricity through the circuit, and'pre cipitating the lead salt thusformed by means oi. a soluble salt 0! arsenic; a

- CORNELIUS D. VREELAND.

circuit, and precipitating the lead. salt thus tormed by

